At the end of 1985's Back to the Future, Doc Brown opens his Delorean and dumps table scraps and beer into a "Mr. Fusion" tank to generate the power to whisk Marty McFly into the year 2015. Now it's 2017, and although personal fusion-powered travel is still in the distant future, the ability to fly passenger planes using food waste is here. In September, JetBlue announced a plan to purchase more ...